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Is there any difference between the proportion of Americans who wish they were rich and the proportion of Canadians who wish they were rich?
A researcher is comparing the reaction times of a 10-year-olds who play video games and 10-year-olds who do not.
A random sample of students who took the SAT college entrance exam twice found that 427 of the respondants had paid for coaching courses
Let m denote the average amount of money a household in County X spent on automobile insurance in 2009. You want to use a simple random sample
The breaking strength of a random sample of n = 20 bundles of wood fibers has a sample mean x-bar = 436.5 and sample standard deviation s = 11.90.
"Durable Press" cotton fabrics are treated to improve their recovery from wrinkles after washing. Unfortunately, the treatment also reduces the strength
Given: X ¯ = 97, sx = 16, nx = 64, Y ¯ = 90, sY = 18, nY = 81; assume the samples are independent. Construct a confidence interval of µX - µY
Business Week surveyed MBA alumni 10 years after graduation (Business Week, September 22, 2003)
Can demographic information be helpful in predicting sales at sporting goods stores? The data at left are monthly sales totals from a random sample
The average time it takes to complete a test is first-year statistics is 46.2 minutes. the standard deviation is 8 minutes
Hallux abducto valgus (HAV) (deformation of the big toe that often requires surgery). Doctors used x-rays to measure the angle (in degrees)
How well a material conducts heat matters when designating houses, for example. Conductivity is measured in terms of watts of heat power transmitted
Our decisions depend on how the options are presented to us. Here's an experiment that illustrates this phenomenon.
A Company surveys 32 randomly selected employees and ask the number spent working at home after hours during a week. The results as shown below:
A study was carried out by JT Co. Regarding the stopping distance of a 1300 kilogram car under perfect weather conditions at various driving speeds
In a recent survey, 161 of 493 employees responded that they typically took work with them on vacation and 95 responded that there are unwritten
The data shown below represents the total fat, in grams per serving, for a sample of 20 chicken sandwiches from fast-food chains. Complete parts (a) through (d)
A scientist wants to estimate the proportion of plants with berries growing in a particular region. They want to be within 6% of the true proportion
Temperature measurements are recorded at 40 randomly selected different locations for a particular city. A sample mean of 20 degrees Celsius is obtained
Calculate and interpret the confidence interval. Please show your manual calculation or the software output.
Amazon.com claims that its textbook prices are cheaper than those offered by the local college bookstore
A confidence interval for the population mean tells us which values of mean are plausible (those inside the interval) and which values are not plausible
A recent poll (fictitious) reports that President Obama's "approval rating" is 52% and a statement says, "This poll has an error rate of 3%."
AluminiCorp is a major producer of aluminum cans that produces 40 billion aluminum cans every year. You work as a quality control officer for AluminiCorp
How heavy a load (pounds) is needed to pull apart pieces of Douglas fir 4 in long and 1.5 inches square? Here are the data from students doing a laboratory